forked from luck/tmp_suning_uos_patched
335e92e8a5
mb_cache_entry_alloc() was allocating cache entries with GFP_KERNEL. But filesystems are calling this function while holding xattr_sem so possible recursion into the fs violates locking ordering of xattr_sem and transaction start / i_mutex for ext2-4. Change mb_cache_entry_alloc() so that filesystems can specify desired gfp mask and use GFP_NOFS from all of them. Signed-off-by: Jan Kara <jack@suse.cz> Reported-by: Dave Jones <davej@redhat.com> Cc: <linux-ext4@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
/*
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File: linux/mbcache.h
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(C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
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*/
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/* Hardwire the number of additional indexes */
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#define MB_CACHE_INDEXES_COUNT 1
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struct mb_cache_entry {
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struct list_head e_lru_list;
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struct mb_cache *e_cache;
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unsigned short e_used;
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unsigned short e_queued;
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struct block_device *e_bdev;
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sector_t e_block;
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struct list_head e_block_list;
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struct {
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struct list_head o_list;
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unsigned int o_key;
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} e_indexes[0];
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};
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struct mb_cache_op {
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int (*free)(struct mb_cache_entry *, gfp_t);
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};
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/* Functions on caches */
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struct mb_cache * mb_cache_create(const char *, struct mb_cache_op *, size_t,
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int, int);
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void mb_cache_shrink(struct block_device *);
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void mb_cache_destroy(struct mb_cache *);
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/* Functions on cache entries */
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struct mb_cache_entry *mb_cache_entry_alloc(struct mb_cache *, gfp_t);
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int mb_cache_entry_insert(struct mb_cache_entry *, struct block_device *,
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sector_t, unsigned int[]);
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void mb_cache_entry_release(struct mb_cache_entry *);
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void mb_cache_entry_free(struct mb_cache_entry *);
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struct mb_cache_entry *mb_cache_entry_get(struct mb_cache *,
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struct block_device *,
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sector_t);
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#if !defined(MB_CACHE_INDEXES_COUNT) || (MB_CACHE_INDEXES_COUNT > 0)
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struct mb_cache_entry *mb_cache_entry_find_first(struct mb_cache *cache, int,
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struct block_device *,
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unsigned int);
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struct mb_cache_entry *mb_cache_entry_find_next(struct mb_cache_entry *, int,
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struct block_device *,
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unsigned int);
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#endif
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